The Dynamo Effect Flashcards
What is the process generators use and what is it called?
Generators convert movement of a turbine into electricity using a magnet. This called electromagnetic (EM) induction.
What are the 2 situations where you get EM induction?
1) An electrical conductor moves through a magnetic field often a coil of wire is used.
2) The magnetic field through an electrical conductor changes.
What can you increase to get a bigger voltage and currency?
The strength of the magnet. The number of turns on the foil. The speed of movement.
Why do generators produce an alternating current (AC)?
Generators rotate a coil in a magnetic field. Every half turn of the coil it changes direction. This is because the south and north of a magnet are on opposite sides. Once the coil has passed one side of the magnet it is heading for the other hence change in direction. This cause alternating current.
If you saw an alternating current on display you would see something that looks like a wave. What happens to the amount of peaks when the coil turns faster?
The amount increases.
The frequency of AC electrical supplies is and what is it measured in?
The numbers of cycles per second and measured in Hertz (Hz).
How many hertz is the electricity supplies in the uk?
50
What would DC from batteries and photocells if it was plotted on a graph?
It would be a straight line.
What is the dynamo effect?
It is transforming kinetic energy into electric energy. This is done using electromagnetic induction.
